This document describes the specifications and features of a 110V DC main switchboard and distribution board. The main switchboard has 400A incoming and outgoing feeders consisting of MCCBs and MCBs of various ratings. It also includes busbars, cable entries, mounting, control supply voltage details. The distribution board has a 160A incoming breaker and various single and three phase MCBs as outgoing connections. It provides specifications like voltage rating, fault level, protection class and other technical details. The document further explains features of MCCBs, MCBs, operational procedures and philosophy of the switchboards.

1.  110V MAIN LV DC MAIN SWITCH BOARD
1. Incoming feeders 400A, 3P withdrawable MCCB – 2 Tiers (A1, B1)
2. Bus coupler feeder 400A, 3P withdrawable MCCB – 1 Tier (AB0)
3. Outgoing MCCB & MCB withdrawable Feeders – 4 Tiers (A2, A3&B2, B3)
a. 250A, 3P MCCB – 3 modules
b. C-16A, 3P MCB – 30 modules
c. C-25A, 3P MCB – 29 modules
d. C-32A, 3P MCB – 38 modules
e. C-40A, 3P MCB – 8 modules

2. 2
 DB PANEL - SDB-LH1
1. Incoming breaker 160A, 4P withdrawable MCCB
2. Outgoing MCB
a. C-16A, 1P MCB – 16 qty.
b. C-25A, 1P MCB – 7 qtys.
c. C-16A, 3P MCB – 10 qtys.
d. C-32A, 3P MCB – 9 qtys.

3. 3
 Rated Nominal Voltage : 110V DC
 Rated Current : 400A
 Fault Level : 50kA for 1 Sec.
 Degree of Protection Switchboard : IP 43
 Form of Segregation : Form 4B Type-6
 Cable Entry – Incoming Side : Bottom
Outgoing Side : Bottom
 Cable Access
 a) Incoming : Rear
 b) Outgoing : Rear
 Type of Mounting : Floor Mounting
 Control Supply Voltage : 110V DC - indication lamps (Internally derived)
240V AC – Heater Circuit & Lamp (Externally
derived)
 Main Busbar (Tinned Copper) : R/Y/B Phase – 1x60x10 Cu per phase
Neutral – 1x60x10 Cu
Earth – 1x300x10 Cu

4. 4
 Rated Nominal Voltage : 415 V AC 3Ph / 240V AC 1Ph
 System Frequency : 50 Hz
 Rated Current : 160A
 Fault Level : 25kA for 1 Sec.
 Degree of Protection Switchboard : IP 54
 Form of Segregation : Form 2B
 Cable Entry – Incoming Side : Top/Bottom
Outgoing Side : Top
 Cable Access
 a) Incoming : Front
 b) Outgoing : Front
 Type of Mounting : Wall/Floor Mounting
 Control Supply Voltage : 415V AC – Power Circuit
240V AC – Control Circuit (internally derived)

5. 5

6. 6

7. 7
LV DC – MCCB FEATURES
Various ratings of Electronic & Thermal Magnetic MCCBs
 Thermal Magnetic  Drawout MCCBs

8. 8
LV DC – WITHDRAWABLE
MCCB FEATURES

9. 9
LV DC – WITHDRAWABLE MCCB OPERATION

10. 10
LV DC – WITHDRAWABLE
MCCB FEATURES

11. 11
LV DC – WITHDRAWABLE MCCB OPERATION

12. LV DC – MCCB FEATURES
 Thermal magnetic
 Thermal Adj 63% to 100%
 Magnetic Adj
 Electronic
 40% to 100%
 Pre set curves to choose
6
8
12
10
0.8
0.63
1
Ir (x ln) Ii (x ln)
125A
TRIPPED
ON OFF
MANUAL OPERATION

13. MCCB INTERNAL ACCESSORIES
Auxiliary
Auxiliary
Alarm
Alarm
Shunt UVT
LV DC – MCCB FEATURES

14. 14
LV DC – MCCB FEATURES

15. PADLOCK
PROVISION
DOOR INTERLOCK &
PADLOCK
15
LV DC – MCCB FEATURES

16. LV DC – MCCB OPERATION & MAINTENANCE

17. 17
LV DC – MCB MAIN FEATURES
MCB Functions
 Protection against
overloads and short-
circuits
 Switching and isolation
OPERATION DIRECTION
ON
(O)
OFF
(I)

18. 18
OPERATIONAL PROCEDURE

19. 19
DOOR LIMIT SWITCH
Functions
 Protection against
accidental open when the
panel is live
DIGITAL VOLTAGE MONITORING RELAY
EARTH LEAKAGE RELAY

20. 20
LV DC – OPERATIONAL PHILOSOPHY

21. 21
DB – MAIN FEATURES
MANUAL CHANGE OVER SWITCH OPERATING PRNCIPLE
DOOR HANDLE OPERATION

22. 22
INDICATION LIGHTS, PUSH BUTTON & SELECTOR SWITCHES – LV DC
LV DC & DB – MAIN FEATURES
 If line side (Incoming Supply) is energized, +VE phase lamps will work
Supply Healthy – RED
 Analogue Voltmeter, Ammeter
 Based on the MCCB & MCB position the following lamp identification will work
RED – MCCB Close
GREEN – MCCB Open
AMBER – TRIP position for MCCB & MCB
BLACK P.B. – Lamp Test
 Selector Switch
Bus Coupler auto Off/On
 If line side (Incoming Supply Source-1 or Source-2) is energized, R/Y/B phases individual lamps will work
R-phase – RED / Y-phase – YELLOW / B-phase – BLUE
RED – HEATER On
 Analogue Voltmeter, Ammeter with selector switches
 Selector Switch
Heater selector Off/On
INDICATION LIGHTS, PUSH BUTTON & SELECTOR SWITCHES – DB